17. Rachel Dratch (1999-2006)
Even if Rachel Dratch isn't the focus of a particular skit, it's hard to take your eyes off of the Second City improv vet: Her expressive face and chameleon-like ability to inhabit and conquer roles as random as Elijah Wood, Arianna Huffington, and Harry Potter help her steal the show on the regular, whether she intended to or not.
Just consider that Debbie Downer sketch for a moment—it's hard to believe that any cast member could've delivered the same laughs as Dratch during those close-ups, even with the ridiculous trombone effects. What can we say? She's got that je ne sais quoi. And, as that Hip Hop Kids sketch with Justin Timberlake also revealed, a shocking ability to dance that none of us saw coming.